16654577621 has 8 divisors (see below), whose sum is σ = 18269011488. Its totient is φ = 15056874000.

The previous prime is 16654577581. The next prime is 16654577683. The reversal of 16654577621 is 12677545661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16654577621 - 2⁶ = 16654577557 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16654577621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16654577321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4180475 + ... + 4184456.

It is an arithmetic number, because the mean of its divisors is an integer number (2283626436).

Almost surely, 2^16654577621 is an apocalyptic number.

16654577621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16654577621 is a deficient number, since it is larger than the sum of its proper divisors (1614433867).

16654577621 is a wasteful number, since it uses less digits than its factorization.

16654577621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8365123.

The product of its digits is 2116800, while the sum is 50.

The spelling of 16654577621 in words is "sixteen billion, six hundred fifty-four million, five hundred seventy-seven thousand, six hundred twenty-one".